Inside secret vault holding long-lost art treasures

26 March 2014 Last updated at 20:32 GMT

Cornelius Gurlitt is a reclusive man, but he was recently found to be holding one of the world's biggest private art collections - close to 1,500 pieces that he had stored at his homes in Munich and Salzburg.

It is though much of it came from his father, a dealer licensed by the Nazis to buy and sell art, and may have been stolen from Jewish families.

The works, by artist such as Picasso, Renoir, Monet, are now being held in secure warehouses and vaults by restorers and experts trying to trace their history.

The BBC's Stephen Evans was granted exclusive access to look at some of the long-lost masterpieces which had been kept hidden for decades.